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Ultrafast terahertz emission from emerging symmetry-broken materials

Light(Science & Applications) 2023年第7期12卷 1216-1245页

作者： Jacob pettine prashant padmanabhan Nicholas Sirica rohit p.prasankumar Antoinette J.Taylor Hou-Tong Chen Center for Integrated Nanotechnologies Los Alamos National LaboratoryLos AlamosNM87545USA Deep Science Fund Intellectual VenturesBellevueWA 98005USA

Nonlinear optical spectroscopies are powerful tools for investigating both static material properties and light-induced ***(THz)emission spectroscopy has emerged in the past several decades as a versatile method for directly tracking the ultrafast evolution of physical properties,quasiparticle distributions,and order parameters within bulk materials and nanoscale *** optically-induced THz radiation is often analyzed mechanistically in terms of relative contributions from nonlinear polarization,magnetization,and various transient free charge *** this offers material-specific insights,more fundamental symmetry considerations enable the generalization of measured nonlinear tensors to much broader classes of *** thus frame the present discussion in terms of underlying broken symmetries,which enable THz emission by defining a system directionality in space and/or time,as well as more detailed point group symmetries that determine the nonlinear response *** this framework,we survey a selection of recent studies that utilize THz emission spectroscopy to uncover basic properties and complex behaviors of emerging materials,including strongly correlated,magnetic,multiferroic,and topological *** then turn to low-dimensional systems to explore the role of designer nanoscale structuring and corresponding symmetries that enable or enhance THz *** serves as a promising route for probing nanoscale physics and ultrafast light-matter interactions,as well as facilitating advances in integrated THz ***,the interplay between intrinsic and extrinsic material symmetries,in addition to hybrid structuring,may stimulate the discovery of exotic properties and phenomena beyond existing material paradigms.

关键词： symmetry enable nonlinear

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